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Hemoglobin O-Arab. Hemoglobin O-Arab (American English) or Haemoglobin O-Arab (British English) is a rare alternation of Hemoglobin (American English) or Haemoglobin (British English), characterised with the presence of β^121Glu → Lys (Hb O-Arab). Mutations of heterozygotes for Hb O-Arab have been reported in Saudi Arabia, North Africa ...
Presentation. The condition is asymptomatic, and is only noticed when screening for other hemoglobin disorders. [citation needed]Sickle cell disease. In persons with sickle cell disease, high levels of fetal hemoglobin as found in a newborn or as found abnormally in persons with hereditary persistence of fetal hemoglobin, the HbF causes the sickle cell disease to be less severe.
In genetics, dominance is the phenomenon of one variant ( allele) of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome. [1] [2] The first variant is termed dominant and the second is called recessive. This state of having two different variants of the same gene on ...
Sickle-cell anemia is an autosomal recessive disorder that affects 1 in 500 African Americans, and is one of the most common blood disorders in the United States. The single replacement of the sixth amino acid in the beta-globin, glutamic acid, with valine results in deformed red blood cells. These sickle-shaped cells cannot carry nearly as ...
Thus, in regions where malaria exerts or has exerted a strong selective pressure, sickle cell anemia has been selected for its conferred partial resistance to the disease. While homozygotes will have either no protection from malaria or a dramatic propensity to sickle cell anemia, heterozygotes have fewer physiological effects and a partial ...
Normocytic anemia. Normocytic anemia is a type of anemia and is a common issue that occurs for men and women typically over 85 years old. Its prevalence increases with age, reaching 44 percent in men older than 85 years. [1] The most common type of normocytic anemia is anemia of chronic disease. [1]